Re: [PATCH] nvmet-rdma: Don't use the inline buffer in order to avoid allocation for small reads
From: Christoph Hellwig <hidden>
Date: 2016-08-02 12:50:42
Also in:
linux-nvme
On Mon, Aug 01, 2016 at 11:36:39AM +0300, Sagi Grimberg wrote:
Under extreme conditions this might cause data corruptions. By doing that we we repost the buffer and then post this buffer for the device to send. If we happen to use shared receive queues the device might write to the buffer before it sends it (there is no ordering between send and recv queues). Without SRQs we probably won't get that if the host doesn't mis-behave and send more than we allowed it, but relying on that is not really a good idea.
Pitty - it seems so wasteful not being able to use these buffers for anything that isn't an inline write. I fully agree on the SRQ case, but I think we should offer it for the non-SRP case. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html